本論文設計兩種新型直流-直流轉換器，其中包含新型高效率單輸入三輸出直流-直流轉換器及高效率隔離型可逆式單輸入多輸出直流-直流轉換器。高效率單輸入三輸出直流-直流轉換器具有高電壓轉換比以維持高壓直流匯流排能量，供給後級逆變器使用。高效率單輸入三輸出直流-直流轉換器使用一低匝數比之耦合電感達成高昇壓電壓增益，且採用輔助電感間接調整輔助電源輸出電壓；此外，高效率單輸入三輸出直流-直流轉換器透過電壓箝制及零電流切換技術，使本裝置具有高效率轉換及三種不同輸出電壓等級之特點。本論文為達到電氣隔離的功能，進階設計具有隔離架構之高效率隔離型可逆式單輸入多輸出直流-直流轉換器，可控制其雙向能量傳遞，並擁有高效率電源轉換之特性。高效率隔離型可逆式單輸入多輸出直流-直流轉換器可分別操作於降壓模式及昇壓模式，在降壓模式下，高壓直流匯流排多餘之能量可對予許雙向能量傳遞之輸入電源進行儲能；在昇壓模式下，低壓輸入電源之能量傳送到高壓直流匯流排，可供給後級逆變器負載所需之動力，且在兩個模式下同時具有一輔助電源對輔助電池進行浮充以維持輔助電池電量以穩定周邊元件所需能量。高效率隔離型可逆式單輸入多輸出直流-直流轉換器採用耦合電感為主之架構以提高昇/降壓之電壓比，且透輔助電感的設計間接調整輔助輸出端之電壓，同樣使用電壓箝制及柔性切換之技術，達到高效率電源轉換、雙向能量傳遞、高昇/降壓比以及多種輸出電壓等級之特點。本論文研製實際原型機並以實作結果驗證所發展之新型高效率單輸入三輸出直流-直流轉換器及高效率隔離型可逆式單輸入多輸出直流-直流轉換器電力轉換技術的有效性。

This thesis presents two kinds of newly-designed dc-dc converters including a high-efficiency single-input triple-outputs dc-dc converter (HSTDC) and a high-efficiency isolated bidirectional dc-dc converter (HEIBDC). The proposed HSTDC has a high voltage conversion ratio to sustain the high-voltage dc bus for the possible utilization of a later dc-ac inverter. The proposed HSTDC uses a coupled inductor with lower turn ratios to achieve the high step-up voltage gain, and adopts an auxiliary inductor to adjust the voltage of the auxiliary output terminal indirectly. Moreover, the utilization of voltage clamping and zero-current switching (ZCS) in the proposed HSTDC is helpful for accomplishing the goal of high-efficiency power conversion and three output voltage levels. In order to further achieve the objective of galvanic isolation, the proposed HEIBDC with an isolated framework can control bidirectional power flow with the property of high-efficiency power conversion. The proposed HEIBDC can be operated at two modes including the step-down mode and the step-up mode. At the step-down mode, the high-voltage dc bus transmits extra energy to charge the bidirectional input power source. At the step-up mode, it can transmit the energy from the input power source to the high-voltage dc bus for the utilization of a later dc-ac inverter, and from the auxiliary source (e.g., a battery module) to supply power for peripheral devices. The proposed HEIBDC uses a coupled inductor to increase the step-up/step-down voltage ratio, and adopts an auxiliary inductor to indirectly adjust the voltage of the auxiliary output terminal. Furthermore, the techniques of voltage clamping and soft switching are also used. As a result, the objectives of high-efficiency power conversion, bidirectional energy transmission, high step-up/step-down ratios, and various output voltages with different levels can be obtained in the proposed HEIBDC. The effectiveness of the proposed HSTDC and HEIBDC are verified by rich experimental results via practical prototypes.

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